Solange Knowles knows all about living in a shadow, as her five-time Grammy-winning and multi-platinum-selling older sister Beyonce must cast a football field-sized one. The younger Knowles, however, is clearly eager to gain some ground in this sibling rivalry. Her possible second single, Sandcastle Disco, off her sophomore album, Sol-Angel and the Hadley St. Dreams (out August 26), is a catchy little pop anthem in the vein of Rihanna’s Umbrella. Set against an oldskool breakbeat produced by Soul Shock, Solange’s voice sounds eerily like Beyonce’s with a diminished range. Still, the track is just endearing enough to make up for this. I’m not sure what Mathew Knowles fed his daughters growing up, but whatever it was, it worked.